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MCQs

Dc Motors

Total Questions : 240 | Page 5 of 24 pages
Question 41. The plugging gives the
  1.    Zero torque braking
  2.    Smallest torque braking
  3.    Highest torque braking
  4.    None of the above
 Discuss Question
Answer: Option C. -> Highest torque braking
Question 42. The speed of a D.C. series motor is
  1.    Proportional to the armature current
  2.    Proportional to the square of the armature current
  3.    Proportional to field current
  4.    Inversely proportional to the armature current
 Discuss Question
Answer: Option D. -> Inversely proportional to the armature current
Question 43. When two D.C. series motors are connected in parallel, the resultant speed is
  1.    More than the normal speed
  2.    Loss than the normal speed
  3.    Normal speed
  4.    Zero
 Discuss Question
Answer: Option A. -> More than the normal speed
Question 44. Which of the following motors one will choose to drive the rotary compressor?
  1.    D.C. shunt motor
  2.    D.C. series motor
  3.    Universal motor
  4.    Synchronous motor
 Discuss Question
Answer: Option D. -> Synchronous motor
Question 45. In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
  1.    Remain unchanged
  2.    Reduce to one-fourth value
  3.    Increase four folds
  4.    Be doubled
 Discuss Question
Answer: Option A. -> Remain unchanged
Question 46. Which D.C. motor is preferred for elevators?
  1.    Shunt motor
  2.    Series motor
  3.    Differential compound motor
  4.    Cumulative compound motor
 Discuss Question
Answer: Option D. -> Cumulative compound motor
Question 47. During rheostatic braking of D.C. series motors
  1.    Motor is run as a generator
  2.    Motor is reversed in direction
  3.    Motor is run at reduced speed
  4.    None of these
 Discuss Question
Answer: Option A. -> Motor is run as a generator
Question 48. In a D.C. generator all of the following could be the effects of iron losses except
  1.    Loss of efficiency
  2.    Excessive heating of core
  3.    Increase in terminal voltage
  4.    Rise in temperature of ventilating air
 Discuss Question
Answer: Option C. -> Increase in terminal voltage
Question 49. If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will
  1.    Increase
  2.    Decrease
  3.    Remain same
  4.    Become zero
 Discuss Question
Answer: Option A. -> Increase
Question 50. Speed control by Ward Leonard method gives uniform speed variation
  1.    In one direction
  2.    In both directions
  3.    Below normal speed only
  4.    Above normal speed only
 Discuss Question
Answer: Option B. -> In both directions

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